Protected tubing



Jamil, 1938. H, J, LITTLE 2,105,124

PROTECTED TUBING I Filed May 7, 1935 2 Sheets-Sheet 1 TIM W H M1 020 INVL'NRSR. Harm/P0 J LITTLE A'I'TOI-ZNEY,

I. w i an mm a" I f Jan. 11, 1938;

H. J. LITTLE PROTECTED TUBING Filed May 7, 1935 2 Sheets-Shet 2 IIIIIIIIIIIII'IIIIIIIII I N\ E NTUR. HOWARD J LITTLE \TTORNEX Patented Jan. .1 l, 1938 PATENT OFFICE PROTECTED TUBING Howard J. Little, Fort Thomas, Ky., assignor, by mesne assignments, to The Andrews Steel (to pally, a corporation of Delaware Application May "I, 1935, Serial No. 20,224 '1 Claims. o 138-70) This invention relates to protecting tubes, pipes, drains, conduits and the like, which. are constructed usually of metallic or other suitable materials, and particularly pertains to tubes and the like which are corrugated in' structure and provided with material applied at the base portion on the inner wall to provide a substantially thick lining to protect the bottom wall of the tube during use and resist the deteriorating abrasive action of fluids and solids passing therethrough.

It has heretofore been the practice in providing a compositionlining on the bottom wall of corrugated tubes and the like to utilize some composition material such as asphalt, which-may be u advantageously applied in a melted condition and permitted to flow to fill the valleys between the corrugations and form a smooth bottom layer over the lower portion of the tube and the like. This construction is subject to certain disadvantages both in the manner of applying the lining and also in the resulting lined structure.

It is the aim of the present invention to provide a lining by first preforming'the composition material into preformed strips or slabs and then insert these preformed strips or slabs in the tubing and the like, these being preferably inserted after being also arched or otherwise shaped to conform to the contour of the tubing. The outer wall or face of the preformed insert strip is shaped to conform to the contour of the inner wall of the tubing and the like, and the inner wall or face of the preformed insert strip which is that portion to be exposed when the insert is placed within the tubing is provided with means '8 whereby sediment and other refuse is caused to i be removed from the tubes and the like by the water flowing through same. For a better understanding of the invention reference may be made to the accompanying g, drawings in which- Fig. l is a top plan view of a preformed strip,

. preferably arched and preshaped, embodying the invention, and adapted to be inserted within tubes and the like for lining the bottom wall A thereof;

" Fig. 2 is a top plan view of the strip in Figure 1 after it has been provided with a corrugated interior and exterior wall surface, and preferably arched in conformity with the curvature of the tube and the like;

- Fig. 3 is a side eievational view of the precorrugated preformed strip of Fig: 2 with a part broken away; 7 v Fig. 4 is a fragmentary cross-sectional view V through the tubing and preformed strip;

Fig. 5 is a perspective view of a protected tubing or the like embodying the present invention;

Fig. 6 is a perspective view of another embodiment of the preformed insert strip; Fig. 7 is a cross-sectional view of a tubing or 5 the like embodying the present invention;

Fig. 8 is a detailed view partly in cross-section showing the tubing being treated to coat same with a waterproofing covering; and

Fig. 9 is a fragmentary section. of a tubing em- 10 bodying the present invention. Y

Referring to the drawings in which like numerals are used to designate like parts, numeral i designates a blank strip formed of any suitable moldahle composition material, typified by a bitul5 minous compound such as asphalt or the like which may be utilized in a pure condition or have a filling of mineral material vegetable fibers incorporated therein. The material may be molded .or otherwise formed, heating it if necessary, into the shape desired by any suitable method. At

the time of moldingor subsequently thereto the strip may be corrugated with any number of corrugations 2 on its outer wall, spaced apart by intervening recesses 3. The corrugations 2 and intervening recesses 3 correspond to circumferentially dispo ed corrugations l and recesses 4' disposed on the interiorwall'of a tubing 5. The preformed strip may beof any desirable thickness but is preferably of sufiicient thickness to fill the recesses 4' between the corrugations 4 on the inside wall of the tubing, thereby providing an exposed bottom floor or surface on the preformed strip which is above the crests of 'the corrugations. The strip i, except for the corrugations 2 and recesses 3, may be of uniform thickness throughout its entire length and breadth and providing a substantially, even smooth surface on its exposed face within the tubing, or the exposed face may preferably beprovided with a series of longitudinally disposed corrugations 6 alternatingly disposed with intervening recesses I. It has been found that in a structure of this character that dirt, sediment and other foreign material is directedinto the re- 5 cesses 'l and to the bottoms thereof where the full force of the liquid flowing through the tubing is directed against the sediment and foreign materials to remove samefrom the tubing and prevent it from collecting and building up in the 5 bottom of the tubing. By having the corrugations 6 and the recesses i longitudinally disposed in parallel relation several separate and distinct valleys are provided and these are advantageous in breaking up the sediment and foreign material and also in preventing building up of same into deposits rather than being subjected to the full force of the water flow. It will be understood, however, that while several recesses and corrugations are believed more effective in breaking up the sediment, the invention is not limited to any number of corrugations and recesses,- but it is within the scope of the invention to corrugate the exposed surface of the strip with one or more corrugations and recesses for directing the water against the sediment for removing same.

A preformed strip is first made into suitable size and is at the same time or thereafter shaped to the contour of the tubing in which it is to be inserted and corrugated. Then when inserted within the tubing the corrugated wall of the preformed strip fits in place with the annular disposed corrugations on the inside wall of the tubing fitted within the recesses l on the wall of the preformed strip and corrugations on the strip fitted within recesses l' in the tubing. Heat is applied from any source, typified by a blow torch 8, with the fiame 9 applied against the wall of the tubing, thereby causing to melt that portion of the strip which is in contact with the interior wall of the tubing and bonding the preformed insert strip adhesively with the interior wall of the tubing. Before or after the preformed strip is inserted in place within the tubing, the tubing may be advantageously coated on the inside wall with a coating layer it and on the outside wall with a coating layer II. This inside and outside coating may be applied in any suitable way. One manner of applying the coatings is illustrated in Figure 8 in which a supply of asphalt or other waterproofing material may be liquefied in the container l2 by means of a heating device IS. The tubing may be supported in any suitable way for immersion in the container for receiving the coating material. One supporting device is typified by a spider i3 provided with arms I disposed to contact with the ends of the tubing. One spider is supported on a stub shaft l5 journaled in an arm IS. The stub shaft I5 is also slidably mounted on the arm with a spring I! thereon interposed between a shoulder It on the spider l3 and the arm, thereby permitting one spider to be spaced from the other spider for accommodating tubing of various lengths. The other spider is of the same construction and is mounted on a stub shaft I9 journaled in arm 20 and adapted to be driven by a drive wheel 2| actuated from any power source. The tubing mounted upon the spiders is immersed a suitable depth in the liquid waterproofing material within the casing i2 and may be rotated by means of any suitable driving means associated with the drive wheel 2i mounted upon one of the mandrels to apply a protective filmcoating to the inner and outer walls. A protected tubing will be produced having the preformed strip insert forming one substantially thlck wear resisting section on the inner wall thereof and one protecting layer covering the entire inside wall of the metal portion and the preformed insert wearresisting and another protecting layer covering the entire outer wall of the tubing. Accordingly all exposed parts of the tubing are entirely covcred with the waterproofing material and protected thereby.

In Figure 6 there is disclosed an embodiment of the preformed insert. It is like that embodiment in Figure 2 arched from a plain strip, such as in Figure l, and provided on the exterior side with circumferentially disposed corrugations 2' and recesses l in order to correspond with complementary corrugations and recesses of the tubing. on the exposed side of the preformed insert spaced corrugations 8' and recesses 'I' are provided longitudinally, but rather than being in parallel arrangement as shown in Figures 2 and 5, they are in non-parallel arrangement, and arranged to provide a series of valleys converging at a lower level to provide a substantially common main channel along the lowest level of the exposed side of the preformed insert which is inserted in the tubing. Accordingly all water is caused to flow from a higher level to the main channel which is at a lower level, thereby causing the foreign material and sediment to'be forced into the lower channel where it is more effectively removed from the tubing.

From the above description the construction of a pipe coated and provided with a preformed insert will be readily understood but it may be stated generally that by way of resume that a blank of composition material is first formed or cut from a larger sheet into desired dimension and is arched to,conform to the curvature of the tubing. One side is provided with exterior corrugations corresponding with the annulariy disposed corrugations of the tubing and adapted to interfit therewith. At the same time or subsequently the longitudinally disposed corrugations on the exposed surface may be formed. These preformed inserts are preferably made, for convenience of manufacture and handling, in small sections which are then laid in end to end relation within the tubing to form a protected layer throughout the entire length thereof. Also two or more sections of tubing constructed as above described may be laid in end to end relation and overlapped with the preformed insert sections of adjacent tubing sections abutting to form a continuous wear resisting layer throughout the length of the abutting tubing sections. After the tubing sections have the preformed inserts placed therein, heat is applied preferably against the exterior wall of the tubing in order to slightly soften and melt that portion of the surface of the preformed insert which is in contact with the interior wall of the tubing in order to cause same to be adhesively secured. Thereafter the tubing with the preformed insert adhered in place is partially immersed within a tank filled with liquid coating material and rotated in order'to apply a thin film. of waterproofing over the interior and exterior walls of the tubing.

The preformed insert sections may or may not be provided with the longitudinally disposed corrugations on the exposed surface. If these corrugations be provided they may be of any number desired and disposed in any manner to break up the sediment and cause same to be subjected to the full force of the liquid flow rather than being separated therefrom. Where these longitudinally disposed corrugations are used, the coating film is applied tothe inner wall of the tubing without impairing them.

While I have described the invention in detail for the purpose of illustration and have described different embodiments thereof, it will, of course, be understood there may be various changes in detail of construction without departmoldable plastic material having a longitudinal I most section of groove formed in the lowermost portion of the wear surface thereof.

2. A sheet metal tubing having a lower-most section of the interior wall provided with a moldable plastic material having transverse corrugations 'on one surface conforming to corrugations in the tubing and having grooves formed in the wear surface at an angle to said transverse corrugations. I v

3. A sheet metal tubing having a lower-most section of the interior wall provided with a preformed moldable plastic material, and a weather protective coating layer applied to cover the seam between the edges of the preformed material and the adjacent portions of the interior wall.

4.'A .corrugated metal tubing having a lowerthe interior wall provided with a wear resisting lining of moldable plastic material which is preformed and shaped to the curvature of the tubing, and a plurality of spaced apart and-longitudinally disposed corrugations provided on the exposed face of the lining'for preventing the accumulation of foreign material.

5. A tubing having an inner face provided with transverse corrugations, a lining over the lower portion of the tubing completely covering the said transverse corrugations in the lower portion,

said lining formed of a waterproof plastic material in adhesive contact with the tubing and provided with corrugations on its exposed face arranged at an angle to intersect the corrugations on the inner face of the tubing to form a bottom wear surface provided with corrugations prevent. accumulation of foreign material thereon.

6. A preformed moidable plastic strip having one face adapted to be softened andbonded to a tubing and the opposite face provided with a channel having a longitudinally corrugated bottom surface disposed substantially longitudinally thereof.

7. An article of manufacture, a preformed lining strip of thermoplastic composition for corrugated tubing having upon one side transverse corrugations to mate with the corrugations of standard tubing and having on the other side a non-planar wear surface provided with a longitudinal groove in the lowermost portion of the wear surface, said lining strip being sufficiently flexible to conform to the interior wall of the corrugated tubing and of a character to be bonded thereto by the applicationof heat.

' HOWARD J. LITTLE. 

